Fluorescent Probe for Cure Monitoring of Bonding Agent on Surface
K Komatsu, Francis W. Wang
The adhesive strength of a composite resin to dentin is greatly influenced by the degree of cure of the bonding agent. Flouorescent probes have often been used for cure monitoring of resins. The purpose of this study is to select a fluorescent probe for cure monitoring of a photo-cured bonding agent that is applied to dentin. The bonding agent consisted of a mixed monomer (mass fractrions: 50% HEMA and 50% Bis-GMA), a photo-initiator (1x10-4 mol/L AHPBS). Specimens were prepared by irradiating, with visible light for 0 s, 10 s or 60 s, the bonding agent in a silicon mold (10 mm in diameter and 1 mm in depth). These specimens were stored in the dark for 24 h, and then their fluorescence spectra were measured at an excitation wavelength of 520 nm during fluorescence measurements did not cause additional cure of the bonding agent. Although the increase in irradiation time from 10 s to 60 s did not change the peak relatinve fluourescence intensity, the peak fluorescence wavelength markedly decreased, by nearly 30 nm. The fluorescent probe (AHPBS) has been found to be suitable for cure monitoring of bonding agents.